package com.itheima;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

/**
 * 演示Collections工具类的使用
 *
 * Collections如何给代码排序
 */
public class CollectionsDemo {
    public static void main(String[] args) {
        test1();
    }

    private static void texst0() {
        List<String> list = new ArrayList<>();//多态
        Collections.addAll(list,"张三","李四","王五","赵六");
        list.forEach(System.out::println);

        //打乱集合的顺序
        Collections.shuffle(list);
        list.forEach(System.out::println);
    }

//synchronized同步
    public static void test1() {
        List<Integer> list = new ArrayList<>();
        Collections.addAll(list,1,2,3,4,5,6,7,8,9,10);
        Collections.sort(list);
        list.forEach(System.out::println);
        Collections.sort(list, new Comparator<Integer>() {
            @Override
            public int compare(Integer o1, Integer o2) {
                //倒序
                return o2-o1;
            }
        });
        System.out.println("--------------------------------------");
        list.forEach(System.out::println);
        //让Student类实现Comparable接口，让学生也能排序
        List<Student> list1 = new ArrayList<>();
        list1.add(new Student("张三", 20));
        list1.add(new Student("李四", 18));
        list1.add(new Student("王五", 22));
        Collections.sort(list1);
        list1.forEach(System.out::println);


    }
}
